Difference between revisions of "Divisibility rules/Rule for 19 proof"

 
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If <math>k=d_110^0+d_210^1+d_310^2+...</math>, we can say that <math>k+2d_0\equiv 20k+2d_0\equiv 10k+d_0</math>, which is our original number.
 
If <math>k=d_110^0+d_210^1+d_310^2+...</math>, we can say that <math>k+2d_0\equiv 20k+2d_0\equiv 10k+d_0</math>, which is our original number.
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[[Divisibility rules | Back to Divisibility Rules]]

Revision as of 14:19, 22 August 2006

If $k=d_110^0+d_210^1+d_310^2+...$, we can say that $k+2d_0\equiv 20k+2d_0\equiv 10k+d_0$, which is our original number.


Back to Divisibility Rules